Ubuntu Security Notice USN-185-1 – A flaw was detected in the printer access control list checking in the CUPS server. Printer names were compared in a case sensitive manner; by modifying the capitalization of printer names, a remote attacker could circumvent ACLs and print to printers he should not have access to.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40195/USN-185-1.txt
Source: https://packetstormsecurity.com/files/40195/Ubuntu-Security-Notice-185-1.html